Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5e6eee93d3d900…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 01:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0733edaa9971429de9cebd06385c932 SHA-1: 2d2549d2e72a78c6b9125163d9c3afba13bc10eb SHA-256: 9c5e6eee93d3d900038fe65ed09968e318abf3ee2d6f4ae91edbaa3275d73268
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick users into installing a fake browser extension or update, a common social engineering tactic. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=frozen+2+full+movie+free+download+with+english+subtitles
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/77fb34ec76d39d33c264556cb84e8df8/gurasuwa.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/87620935827.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a52573bcf7b---voderosusepo.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba198319ebc---8277773051.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9bc53b9dce7289de6bda49c0b209ef70/kafimatawafopixiraw.pdf
    • http://debden.org/userfiles/file/14902831499.pdf
    • http://ranahytta.com/ckfinder/userfiles/files/wikepisubumudeza.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/o8trmpqmrve205776qdmu80p4i/fidifofebogokisogapo.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6ce71c5742c1e1655e1a9491633305af/lategevebud.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8046416baa80c16b0603f0ec055afbd3/14319484130.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdefb2844a---12010073543.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tkdb2ftvd75sjtg19kf5ei3853/77824222764.pdf
    • http://euroinstytut.pl/galeria/file/bomupiga.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/69d32b012af144d297ad358d558a2b4b/70917345629.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/265062386654eb2f0cee56c47c0d83ba/75243969553.pdf
    • http://caigeshi.com/uploadfile/file/2021052723374973499.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/29bbb231e15c47431e28985550083a5c/nasoza.pdf
    • http://zap-interactive.com/uploads/files/24499868712.pdf
    • https://doganagolosa.it/file/95813052692.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3144b150e1f034670791e08679e9ebb/desijodaxejepisagaxobuwe.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26bc4c758---45681677708.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c465ab6f---fajiwugorutiludipajor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a5.bin
b78573199a9c0f00abe32e5376b3a4760354a33402a81f0d4f764928a13c1016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 16988 bytes
font_01_sfnt_off000120f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
font_02_sfnt_off0001390d.bin
77be709fbb504fae68ece0269d4673144623d81688757bd25b2a07bd720efc0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390D 11348 bytes

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